Working in IT for a bank our small team took it in turns to be on site for the duration but all of us were still expected to be on call as we all had our own sub-areas of experience and expertise including knowing the best team member to contact for any given type of issue (lot of in-house bespoke software in play). Had a decent remuneration in return ramping up to quad time for on site hours and double time for on-call time if called upon, single time if not. But thankfully, due to our due diligence, the event passed us by without a hitch so the only downside was having to moderate our celebratory Y2K drink.
Now, about those neutrino hits on the computer core causing the occasional inexplicable system failure ...